Promax EX-1 Alloy external Sealed Bottom Bracket 68/73mm Black Brake Lever Actuation-Short Pull Shimano BB-5500 Octalink V1 Bottom

Shimano BB-5500 Octalink V1 Bottom BracketsFits Shimano Octalink V1 Spline Cranksets FC-7700/FC-7703/FC-6500/FC-6503/FC-5500/FC-5501/FC-5503/FC-5504 cranks

}Wolf Tooth 1x Chainring Bolt Set - 6mm Dual Hex Fittings Set/4 Blue

}Full Speed Ahead Pro Track 51t x144mm Black Chainring 1/2"x1/8"

Accepts tires up to 28mm wide

Promax EX-1 Alloy external Sealed Bottom Bracket 68/73mm Black Brake Lever Actuation-Short Pull Shimano BB-5500 Octalink V1 BottomPromax EX 1 Alloy external Sealed Bottom Bracket 68 73mm Black. EX 1 External bottom brackets feature cold forged and CNC machined alloy cups dual labyrinth bearing covers and precision sealed bearings. They are the perfect match to Promax CF 2 and HF 2 cranks and ultimate upgrade to the budget BBs sold with most crank sets. Fits all 24 millimeter bottom bracket spindles and frames with 68 or 73 x BC1. 37 bottom bracket shells TECH SPECS Bottom